Drehwurm on "[Theme: Hueman] Post Format Video does not work"

Hi,
when using the Video Post Format and setting the video link it only shows the following: [video src="http://mydomain.com/wp-content/uploads/2013/11/My-Movie.mp4" /]

Using the "normal" way via insert file -> video works.

Am I doing something wrong?

Thanks,
Jörg